CN210990570U - Bone drill - Google Patents

Abstract

The utility model discloses a bone drill, this bone drill include casing, motor, first circuit board, turn to selection switch and switch, and in the casing was located to the motor, and the casing exposed the drive end of motor. The first circuit board is arranged in the shell and connected with the motor, and a control circuit connected with the motor is arranged on the first circuit board to control the motor to operate. The steering selection switch is exposed outside the shell and connected to the control circuit on the first circuit board, and the steering selection switch is provided with three gears which respectively correspond to the first running steering, the second running steering and the suspension so as to indicate the running steering of the motor or control the motor not to run. The power switch is respectively connected with the motor and the control circuit, and the power switch and the steering selection switch are matched to control the motor to run. In this way, the utility model discloses can improve the power control of bone drill and steering control's rationality.

Description

Bone drill

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a bone drill.

Background

The bone drill is an electric tool for drilling holes in bones in a surgical operation, is suitable for providing mechanical power to carry out bone tissue surgery, and at present, the power supply control and the steering control of the bone drill on the market are unreasonable, so that the use of a user is inconvenient, and the use effect of the user is poor for the current bone drill.

Therefore, in order to overcome not enough and defect among the background art, the utility model provides a bone drill, switch with turn to the selector switch cooperation control motor operation for the power control and the steering control of bone drill are more reasonable, more convenient use in the user.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bone drill.

The utility model discloses a realize through following technical scheme:

a bone drill, comprising:

the shell is used for a bone drill component and a carrier of a circuit thereof;

the motor is arranged in the shell, and the shell exposes the driving end of the motor;

the first circuit board is arranged in the shell and connected with the motor, and a control circuit connected with the motor is arranged on the first circuit board so as to control the motor to operate;

a steering selection switch exposed outside the housing and connected to the control circuit on the first circuit board to indicate a running steering operation of the motor;

the power switch is respectively connected with the motor and the control circuit, and the power switch and the steering selection switch are matched to control the motor to run;

the battery component is arranged in the shell and transmits electric energy to the motor when the power switch is switched on;

the second circuit board is arranged in the shell and connected with the power switch and the battery pack, and a power circuit connected with the power switch and the battery pack is arranged on the second circuit board so as to be conducted with the power circuit and the control circuit when the power switch is conducted, and the electric energy of the battery pack is transmitted to the motor.

The utility model has the advantages that: different from the prior art, the power switch and the steering selection switch of the bone drill are matched to control the motor to run, so that the power control and the steering control of the bone drill are more reasonable, the rationality of the power control and the steering control of the bone drill can be improved, and the bone drill is more convenient for a user to use.

Drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the bone drill of the present invention;

FIG. 2 is a schematic diagram of a circuit configuration of a portion of the circuit of the bone drill;

fig. 3 is a schematic circuit diagram of an embodiment of the operational amplifier circuit of the present invention;

fig. 4 is a schematic circuit diagram of an embodiment of the filter circuit of the present invention;

FIG. 5 is a schematic diagram of an electrical circuit of another portion of the circuit of the bone drill;

fig. 6 is a schematic circuit diagram of another embodiment of the bone drill of the present invention;

fig. 7 is a schematic circuit diagram of an embodiment of the steering selection circuit of the present invention;

fig. 8 is a schematic circuit diagram of an embodiment of the power display circuit of the present invention;

fig. 9 is a schematic structural view of an embodiment of the bone drill of the present invention;

fig. 10 is a schematic structural view of another state of the bone drill according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, a motor 1 is disposed in a housing 10, the housing 10 exposes a driving end 13 of the motor 1, the driving end 13 can rotate around its own axis to drive a puncture needle mounted on the driving end 13 to operate so as to perform a bone drill, and the motor 1 may be a brushless motor or a brush motor, which is not limited herein.

The motor 1 comprises a first electrode 11 and a second electrode 12, and a magnetic field is generated by generating a potential difference between the first electrode 11 and the second electrode 12 of the motor 1 to drive the motor 1 to operate, it should be noted that the operation direction of the motor 1 is opposite in both cases that the first electrode 11 is at a high potential and the second electrode 12 is at a low potential and the first electrode 11 is at a low potential and the second electrode 12 is at a high potential, for example, clockwise operation or counterclockwise operation.

The bone drill further comprises a control circuit 2, the control circuit 2 is connected with the motor 1 and used for controlling the motor 1 to work, specifically, the bone drill further comprises a power circuit 3, the power circuit 3 is used for providing electric energy for the bone drill, the control circuit 2 comprises a control chip 21, the control chip 21 is integrated with a logic control circuit 2 and used for controlling all components in the bone drill to work in a coordinated mode, and the control chip 21 can select a low-power-consumption MCU (microprogrammed control unit) to reduce the self-power consumption of the bone drill; the control circuit 2 further comprises a first electric energy input end 22 and a grounding end 4, the control chip 21 is connected with the first electric energy input end 22 and the grounding end 4 respectively, each circuit or component inside the bone drill is connected to the grounding end 4 to achieve grounding, the grounding shown in fig. 1 is connected to the grounding end 4, and the first electric energy input end 22 is used for being connected with the power circuit 3 and transmitting the electric energy from the power circuit 3 to the control chip 21 so as to supply energy to the control chip 21.

Further, the control circuit 2 further includes a first switch 231, a second switch 232, a third switch 233, and a fourth switch 234. The first switch 231 is connected to the first power input terminal 22, the control chip 21 and the first electrode 11, the second switch 232 is connected to the first power input terminal 22, the control chip 21 and the second electrode 12, the third switch 233 is connected to the control chip 21, the first electrode 11 and the ground terminal 4, and the fourth switch 234 is connected to the control chip 21, the second electrode 12 and the ground terminal 4.

Specifically, the control chip 21 controls the first switch 231 and the fourth switch 234 to be in a conducting state, when the first electrode 11 is connected to the first power input end 22, the second electrode 12 is connected to the ground end 4, when the first power input end 22 has power input, the first power input end 22 transmits the power received by the first power input end to the first electrode 11, so that the first electrode 11 is at a high potential, the second electrode 12 is connected to the ground end 4 and is at a low potential, and a potential difference exists between the first electrode 11 and the second electrode 12, so that the motor 1 turns to operate in the first operation; the control chip 21 controls the second switch 232 and the third switch 233 to be in a conducting state, at this time, the first electrode 11 is connected to the ground terminal 4, the second electrode 12 is connected to the first power input terminal 22, when the first power input terminal 22 has power input, the first power input terminal 22 transmits the power received by the first power input terminal to the second electrode 12, so that the second electrode 12 is at a high potential, the first electrode 11 is connected to the ground terminal 4 and is at a low potential, and a potential difference exists between the first electrode 11 and the second electrode 12, so that the motor 1 turns to operate in a second operation direction.

Further, when the bone drill is abnormal, such as current overload, rotation blockage, and over-high temperature, the control chip 21 receives the emergency stop signal, and the control chip 21 controls the third switch 233 and the fourth switch 234 to be in the on state, at this time, the first electrode 11 and the second electrode 12 are not connected to the first power input terminal 22, but are connected to the ground terminal 4, respectively, so that the motor 1 stops operating.

Referring to fig. 1 and 2, the bone drill further includes a voltage conversion circuit 24, and the voltage conversion circuit 24 includes a voltage conversion chip 241, and a first voltage supply terminal 242 and a second voltage supply terminal 243 connected to the voltage conversion chip 241. The first voltage providing terminal 242 is connected to the first power input terminal 22, the first voltage providing terminal 242 provides a first voltage to provide the power from the power circuit 3 to the corresponding circuits and modules including the control chip 21, and the power received by the first voltage providing terminal 242 passes through the voltage converting chip 241, is converted into power having a second voltage by the voltage converting chip 241 and provides the power from the power circuit 3 to the corresponding circuits and modules including the control chip 21 from the second voltage providing terminal 243, and the voltage converting chip 241 is also grounded.

With reference to fig. 1 and 2, the power circuit 3 includes a power output terminal 31, and the power output terminal 31 is used for outputting the power of the power circuit 3 to supply power to the bone drill. The bone drill further comprises a power switch 5, the power switch 5 is connected between the first power input end 22 of the control circuit 2 and the power output end 31 of the power circuit 3, so that the first power input end 22 and the power output end 31 are conducted when the power switch 5 is conducted, at the moment, the first power input end 22 can receive power from the power output end 31 of the power circuit 3 and is used for supplying power to the control chip 21 and the motor 1, and it can be understood that when the power switch 5 is conducted, the first power input end 22 can supply power to the control chip 21 and the motor 1.

Further, the first power input terminal 22 is connected to a port of the control chip 21 receiving power, so that the control chip 21 can receive power from the first power input terminal 22. The first power input terminal 22 is further connected to a port of the control chip 21 for detecting the voltage of the first power input terminal 22, such as the first voltage detection port 211 of the control chip 21 shown in fig. 1, so as to detect whether the voltage of the first power input terminal 22 is abnormal during the use of the bone drill.

The power circuit 3 comprises a battery assembly 32, the battery assembly 32 preferably comprises a plurality of lithium batteries connected in series, for example, 3 lithium batteries, etc., the battery assembly 32 is a provider of the electric energy output by the power circuit 3 to supply the electric energy to the whole system of the bone drill, and the control circuit 2 is used for connecting the battery assembly 32 to obtain the current voltage of the battery assembly 32 during the use of the bone drill and controlling the motor 1 not to operate when the current voltage of the battery assembly 32 is not within the voltage threshold range.

Specifically, the first power input end 22 is connected to the positive pole of the battery assembly 32 through the power switch 5, so that when the power switch 5 is turned on, the power from the battery assembly 32 is input into the first power input end 22, the control chip 21 detects whether the voltage of the first power input end 22 is abnormal or not in the use process of the bone drill, when the current voltage of the battery assembly 32 is not within the voltage threshold range, the voltage threshold range is preferably 8.1V-12.6V, the control chip 21 controls the third switch 233 and the fourth switch 234 to be in the on state, so that the first electrode 11 and the second electrode 12 are respectively grounded, and if the motor 1 is in the operating state, the first electrode 11 and the second electrode 12 are respectively grounded, so that the motor 1 is rapidly stopped; if the motor 1 does not start to operate, the first electrode 11 and the second electrode 12 are grounded, respectively, so that the motor 1 cannot operate even if the power switch 5 is turned on. It is understood that the control of the non-operation of the motor 1 includes both the control of the motor 1 to stop operating for a preset time period or the maintenance of the non-operation of the motor 1, and the following is applicable.

The control circuit 2 may also be configured to obtain the current charge of the battery assembly 32 during the use of the bone drill, and control the motor 1 not to operate when the current charge of the battery assembly 32 is less than the charge threshold, so as to protect the battery assembly 32 from over-discharge. The current electric quantity of the battery assembly 32 is obtained by converting the current voltage of the battery assembly 32 obtained in the above embodiment, and after the current voltage of the battery assembly 32 is obtained, the control chip 21 obtains the current electric quantity of the battery assembly 32 by conversion, so as to count the current remaining electric quantity of the battery assembly 32 and display the electric quantity, wherein the electric quantity threshold is preferably 30% of the maximum electric quantity of the battery assembly 32.

Referring to fig. 1 and 2, the control circuit 2 further includes a second power input terminal 25, the second power input terminal 25 is connected to the power output terminal 31 and the control chip 21, respectively, so as to transmit the power from the power output terminal 31 to the control chip 21 when the power switch 5 is turned off, that is, the power circuit 3 can still supply power to the control chip 21 when the power switch 5 is turned off. Specifically, the second power input terminal 25 is connected to the first voltage providing terminal 242 of the voltage converting circuit 24 as the first power input terminal 22, so that the voltage converting circuit 24 can output power with different voltage amplitudes.

Further, the unidirectional conducting element 6 is disposed between the first power input terminal 22 and the voltage converting circuit 24 and between the second power input terminal 25 and the voltage converting circuit 24, so as to only allow current to be transmitted from the first power input terminal 22 or the second power input terminal 25 to the voltage converting circuit 24, and the unidirectional conducting element 6 may be an electronic component having a unidirectional conducting function, such as a diode, and is not limited herein.

Further, the power circuit 3 further includes a first charging terminal 331 and a second charging terminal 332, and the first charging terminal 331 and the second charging terminal 332 are used for connecting the external power source 7 to charge the power circuit 3. Specifically, the first charging terminal 331 is configured to be connected to the positive electrode of the external power source 7, the first charging terminal 331 is further connected to the positive electrode of the battery assembly 32 to charge the battery assembly 32, the second charging terminal 332 is configured to be connected to the negative electrode of the external power source 7, and the second charging terminal 332 is grounded to ground the negative electrode of the external power source 7.

Specifically, the first charging terminal 331 is connected to the control circuit 2 through the first conducting switch 341, the second conducting switch 342 is connected between the second power input terminal 25 and the power output terminal 31, the control terminal of the first conducting switch 341 is connected to the first charging terminal 331, the first terminal of the first conducting switch 341 is connected to the control terminal of the second conducting switch 342, and the second terminal of the first conducting switch 341 is grounded. A first terminal of the second on-switch 342 is connected to the power output terminal 31, and a second terminal of the second on-switch 342 is connected to the second power input terminal 25.

The second on switch 342 is turned on at a low voltage level and turned off at a high voltage level. In the process of charging the battery assembly 32, the first charging terminal 331 is connected to the positive electrode of the external power source 7, the first charging terminal 331 is at a high potential to control the first conducting switch 341 to be conducted, so that the control terminal of the second conducting switch 342 is grounded, the control terminal of the second conducting switch 342 is relatively at a low potential, so that the power output terminal 31 and the second power input terminal 25 are conducted, it should be noted that when the battery assembly 32 is not charged, the first conducting switch 341 and the second conducting switch 342 are both turned off.

The circuit between the power output terminal 31 and the second power input terminal 25 is further connected to a port of the control chip 21 for detecting the current voltage of the battery assembly 32 during the charging process of the battery assembly 32, such as the second voltage detection port 212 of the control chip 21 shown in fig. 1. When the battery assembly 32 is charged, the second voltage detection port 212 of the control chip 21 receives a voltage input, so that the control chip 21 knows that the battery assembly 32 is being charged, and then controls the third switch 233 and the fourth switch 234 to be in the on state, so that the motor 1 does not operate, and performs other corresponding coordination operations, including displaying the amount of electricity during the charging process.

Referring to fig. 1, the control chip 21 is further connected to the first electrode 11 or the second electrode 12 of the motor 1, the first electrode 11 or the second electrode 12 of the motor 1 is connected to the negative electrode of the battery assembly 32 and then grounded, and the circuit between the motor 1 and the negative electrode of the battery assembly 32 is further connected to the control chip 21 and the sampling resistor 261, so as to obtain the current passing through the motor 1 through the sampling resistor to further determine the working condition of the motor 1.

Specifically, the bone drill further comprises an analysis circuit 26, and a circuit between the motor 1 and the negative electrode of the battery assembly 32 is connected to the control chip 21 through the analysis circuit 26 so as to transmit the sampling current to the control chip 21 through the analysis circuit 26.

As shown in fig. 1 and 3, the analyzing circuit 26 includes an operational amplifier circuit 262, the operational amplifier circuit 262 is connected to the control chip 21, the sampled current I _ sampling is converted into an effective value of current I _ bus through the operational amplifier circuit 262 and is transmitted to the control chip 21, so that the control chip 21 obtains the effective value of the current passing through the motor 1, and the operational amplifier circuit 262 may belong to the understanding range of those skilled in the art, and fig. 3 shows one of the operational amplifier circuits 262.

With reference to fig. 1 and 3, when the effective value of the current passing through the motor 1 is smaller than the no-load current threshold and is continuously set, the motor 1 stops running, the set time is preferably not smaller than 1s, that is, the phenomenon that the effective value of the current passing through the motor 1 suddenly decreases lasts for at least the set time, and it can be considered that the puncture needle assembled by the motor 1 is empty, and the set time is set, which is beneficial to improving the accuracy of judging the operating condition of the motor 1.

Referring to fig. 1 and 4, the analyzing circuit 26 further includes a filter circuit 263, the filter circuit 263 is connected to the control chip 21, the sampled current I _ sampling is converted into an instantaneous value I _ trip of the current by the filter circuit 263 and transmitted to the control chip 21, a comparator (not shown) is disposed in the control chip 21, the comparator is connected to the first electrode 11 or the second electrode 12, and the current passing through the motor 1 is transmitted to the comparator, so that the control chip 21 obtains the instantaneous value I _ trip of the current passing through the motor 1, when an instantaneous large current is generated due to a short circuit, the instantaneous value I _ trip of the current enters the comparator to generate a hardware interrupt, and the control chip 21 can make an adjustment in response in time. The filter circuit 263 can be understood by those skilled in the art, and fig. 4 shows one of the filter circuits 263, and the input terminals of the filter circuit 263 are all connected to the second voltage providing terminal 243, and the detailed circuit principle thereof is not described herein again.

The control chip 21 obtains an instantaneous value of the current passing through the motor 1, and detects whether the instantaneous value of the current passing through the motor 1 is greater than the short-circuit current threshold, so that when the instantaneous value of the current passing through the motor 1 is greater than the short-circuit current threshold, the control chip 21 controls the third switch 233 and the fourth switch 234 to be in a conducting state, and the first electrode 11 and the second electrode 12 are respectively connected to the ground terminal 4, thereby stopping the operation of the motor 1. Whether the instantaneous value of the current passing through the motor 1 is larger than the short-circuit current threshold value is probably that a large current is generated due to the short circuit of a part of the circuit of the motor 1, and the short circuit is controlled to be formed in time so as to control the motor 1 to stop running, so that the damage of the motor 1 due to the short circuit can be effectively avoided.

Of course, in other embodiments of the present invention, the power switch 5 is turned on, at this time, the motor 1 and the power circuit 3 do not form the power supply path, the motor 1 does not start to operate, and the bone drill detects the abnormality, for example, the temperature of the battery assembly 32 is too high, the voltage of the battery assembly 32 is too low, etc., the control circuit 2 also blocks the motor 1 and the power circuit 3, so that the motor 1 and the power circuit 3 cannot form the power supply path, and the motor 1 cannot operate.

The power switch 5 is turned off and then turned on, so that the control chip 21 is powered on again, and the condition of the bone drill is analyzed again, including whether the temperature of the battery assembly 32 is normal, whether the voltage of the battery assembly 32 is normal, and the like. When the bone drill is abnormal, the control chip 21 controls the motor 1 to normally operate, including controlling the motor 1 to operate in the first operation steering or the second operation steering. Specifically, the control chip 21 is turned on again with the power supply circuit 3 and receives power from the power supply circuit 3, and the control chip 21 turns on the first switch 231 and the fourth switch 234, that is, controls the first switch 231 and the fourth switch 234 to be in the on state, or turns on the second switch 232 and the third switch 233, that is, controls the second switch 232 and the third switch 233 to be in the on state, so that the motor 1 is operated again.

Above can see that, it has the protection and triggers the design to bore the bone of this embodiment, specifically at control circuit 2 control motor 1's two poles of the earth to block motor 1 and power supply circuit 3 after, switch 5 breaks off earlier then switches on, makes control circuit 2 switch on with power supply circuit 3 again, thereby makes control circuit 2 control motor 1 switch on with power supply circuit 3 again, and then makes motor 1 rerun.

Referring to fig. 1 and 5, the power circuit 3 further includes a power chip 35. The power supply chip 35 is preferably a charge/discharge management chip or the like. The power supply chip 35 is connected to the battery pack 32. Specifically, the positive electrodes of the batteries 321 in the battery assembly 32 are respectively connected to the power supply chip 35, so that the power supply chip 35 can detect the voltage of the batteries 321 in the battery assembly 32. Wherein the motor 1 is not operated when the voltage of at least a portion of the batteries 321 present in the battery assembly 32 is not within the single battery voltage threshold range.

In this way, when any battery 321 in the battery assembly 32 is under-voltage due to over-discharge or damaged, the power chip 35 can detect the change of the abnormal voltage of the battery 321 in time, that is, the voltage of the abnormal battery 321 is not within the threshold range of the voltage of the single battery, so that the motor 1 does not operate, and the battery assembly 32 stops discharging with high power, thereby preventing further damage to the battery 321 in the battery assembly 32.

Referring to fig. 1 and 5, the battery assembly 32 includes three batteries 321, positive electrodes of the batteries 321 are respectively connected to a first battery voltage port 351, a second battery voltage port 352, and a third battery voltage port 353 of the power chip 35 to respectively detect voltages of the batteries 321, in fig. 5, the first battery voltage port 351 is directly connected to the power output terminal 31, the second battery voltage port 352 and the third battery voltage port 353 are connected to an interface circuit board 354, the interface circuit board 354 is respectively connected to positive electrodes of the batteries 321 in the battery assembly 32, so that the positive electrodes of the batteries 321 in the battery assembly 32 are respectively connected to the power chip 35, and a port for receiving power, i.e., VDD shown in fig. 1 and 5, of the power chip 35 is connected to the power output terminal 31.

With continued reference to fig. 1 and 5, the power circuit 3 further includes a fifth switch 361. A first end of the fifth switch 361 is grounded, a second end of the fifth switch 361 is connected with the motor 1, and a control end of the fifth switch 361 is connected with the power chip 35. That is, the fifth switch 361 is connected to the motor 1 and then grounded, so that a complete circuit loop is formed between the power circuit 3 and the motor 1 to enable the motor 1 to operate normally. When the power switch 5 is in the on state, the power chip 35 controls the fifth switch 361 to be in the off state when the voltage of at least part of the batteries 321 in the battery assembly 32 is not within the threshold range of the voltage of the single battery, so that the circuit loop corresponding to the motor 1 is opened, and the motor 1 is not operated.

Optionally, the voltage threshold range of the single battery is preferably 2.7V-4.225V, and when the voltage of the single battery 321 in the battery assembly 32 is less than 2.7V, the single battery 321 is considered to be over-discharged or damaged; when the voltage of the single battery 321 in the battery assembly 32 is greater than 4.225V, the single battery 321 is considered to be overcharged.

Further, the first charging terminal 331 and the power chip 35 are connected through a sixth switch 362, a control terminal of the sixth switch 362 is connected to the power chip 35, a first terminal of the sixth switch 362 is connected to the first charging terminal 331, and a second terminal of the sixth switch 362 is connected to the positive electrode of the battery assembly 32. When the external power supply 7 connected to the first charging terminal 331 and the second charging terminal 332 charges the battery assembly 32, the power chip 35 controls the sixth switch 362 to be turned on, and the power received by the first charging terminal 331 from the external power supply 7 is supplied to the battery assembly 32 for charging; after the battery assembly 32 is charged, the power chip 35 controls the sixth switch 362 to be turned off, so that the external power supply 7 stops charging the battery assembly 32, and the battery assembly 32 is prevented from being overcharged.

Further, the positive electrode of the battery assembly 32 is connected to the power chip 35 to supply power to the power chip 35, and the one-way conduction element 6 is connected between the connection point of the power chip 35 for receiving power (i.e. VDD shown in fig. 1) and the positive electrode of the battery assembly 32, and the second end of the sixth switch 362 to prevent current from flowing back from the positive electrode of the battery assembly 32 to the second end of the sixth switch 362.

With continued reference to fig. 1, the motor 1 is connected to the negative electrode of the battery assembly 32 and then grounded, and the circuit between the motor 1 and the negative electrode of the battery assembly 32 is further connected to the power chip 35 and the sampling resistor 261. The sampling resistor 261 is used for sampling the current passing through the motor 1, the sampling current collected by the sampling resistor 261 is transmitted to the power chip 35, the effective value and the instantaneous value of the current passing through the motor 1 are obtained through the sampling current, so as to further judge the working condition of the motor 1, fig. 1 shows that the sampling current is transmitted to the power chip 35 and is also transmitted to the control chip 21 at the same time, which means that the power chip 35 and the control chip 21 participate in jointly judging the working condition of the motor 1, and thus the dual protection effect is achieved, the process of judging the working condition of the motor 1 by the control chip 21 is elaborated in detail in the above embodiment, and is not repeated herein.

Specifically, the power chip 35 obtains an effective value of the current passing through the motor 1, and detects whether the effective value of the current passing through the motor 1 is smaller than the no-load current threshold and lasts for a set time length, so that when the effective value of the current passing through the motor 1 is smaller than the no-load current threshold and lasts for the set time length, the power chip 35 controls the fifth switch 361 to be in the off state, so that a circuit loop corresponding to the motor 1 is opened, and the motor 1 stops operating.

Alternatively, the set period of time is preferably not less than 1s, i.e., the phenomenon of a sudden decrease in the effective value of the current through the motor 1 lasts at least for the set period of time before it is considered that the puncture needle equipped with the motor 1 is empty. If the set time is set, the accuracy of judging the working condition of the motor 1 is improved.

In another embodiment, the power chip 35 obtains an instantaneous value of the current passing through the motor 1, and detects whether the instantaneous value of the current passing through the motor 1 is greater than the short-circuit current threshold, so that when the instantaneous value of the current passing through the motor 1 is greater than the short-circuit current threshold, the power chip 35 controls the fifth switch 361 to be in the open state, so as to open the circuit loop corresponding to the motor 1, and further stop the operation of the motor 1. Whether the instantaneous value of the current passing through the motor 1 is larger than the short-circuit current threshold value is probably that a large current is generated due to the short circuit of a part of the circuit of the motor 1, and the short circuit is controlled to be formed in time so as to control the motor 1 to stop running, so that the damage of the motor 1 due to the short circuit can be effectively avoided.

Referring to fig. 1 and 5, the bone drill further includes a thermal sensor 37, wherein the thermal sensor 37 is disposed near the battery assembly 32 to sense the temperature of the battery 321 in the battery assembly 32 and reflect the sensed temperature to the bone drill, so as to monitor the temperature of the battery 321 in the battery assembly 32 in real time, and prevent the battery 321 in the battery assembly 32 from being damaged due to the over-high temperature of the battery 321 in the battery assembly 32 during the use of the bone drill.

Specifically, the thermistor 37 is preferably a thermistor, and may be a positive thermistor or a negative thermistor, and the like, the resistance of the thermistor 37 is affected by the temperature, the thermistor 37 is connected to the power chip 35, the thermistor 37 feeds back the sensed temperature of the battery 321 in the battery assembly 32 to the power chip 35, the power chip 35 determines whether the current temperature of the battery assembly 32 is greater than a temperature threshold value in the use process of the bone drill, and when the current temperature of the battery assembly 32 is greater than the temperature threshold value, the power chip 35 controls the fifth switch 361 to be in an off state, so that a circuit loop corresponding to the motor 1 is opened, and the motor 1 stops operating.

Optionally, the temperature threshold is preferably 70 ℃ during the use of the bone drill, and when the current temperature of the battery assembly 32 is greater than the temperature threshold during the use of the bone drill, the current temperature of the battery assembly 32 is considered to be too high, which is needed to prevent the battery assembly 32 from continuing to discharge with high power, i.e., to control the motor 1 not to operate, so as to reduce the temperature of the battery assembly 32 and play a role in protecting the battery 321 in the battery assembly 32.

In an alternative embodiment, the thermal element 37 may be connected to the control chip 21, the thermal element 37 feeds back the sensed temperature of the battery 321 in the battery assembly 32 to the control chip 21, the control chip 21 determines whether the current temperature of the battery assembly 32 is greater than a temperature threshold value during the use of the bone drill, when the current temperature of the battery assembly 32 is greater than the temperature threshold value, the control chip 21 controls the third switch 233 and the fourth switch 234 to be in an on state, and the first electrode 11 and the second electrode 12 are respectively connected to the ground terminal 4, so as to stop the operation of the motor 1, as shown in fig. 6.

When the external power supply 7 charges the battery pack 32, the power chip 35 controls the sixth switch 362 to be turned on, and the first charging terminal 331 receives the electric energy from the external power supply 7 and supplies the electric energy to the battery pack 32 for charging; when the current temperature of the battery assembly 32 reflected by the thermistor 37 exceeds 55 ℃, the power chip 35 controls the sixth switch 362 to be turned off, so as to avoid the adverse effect of the over-high temperature of the battery assembly 32 on the battery 321 in the battery assembly 32 during the charging process.

Referring to fig. 1 and 7, the selection of the operational steering of the motor 1 is controlled by the user of the drill, who provides the user with a medium for human-computer interaction. Specifically, the bone drill further comprises a steering selection circuit 8, and the steering selection circuit 8 is connected with the control circuit 2 to transmit the information of the operation steering of the motor 1 selected by the user to the control circuit 2 through an electric signal. The steering selection circuit 8 is configured to generate a first steering signal and a second steering signal, wherein the first steering signal corresponds to the operation steering of the electric motor 1 being a first operation steering, and the second steering signal corresponds to the operation steering of the electric motor 1 being a second operation steering.

Further, the control chip 21 is provided with a first steering port 213 and a second steering port 214, the first steering port 213 and the second steering port 214 are respectively connected to a preset potential, the steering selection circuit 8 includes a steering selection switch 81, a first end of the steering selection switch 81 is connected to the ground, and a second end of the steering selection switch 81 is used for connecting the first steering port 213 or the second steering port 214 of the control chip 21, so that the first steering port 213 or the second steering port 214 is connected to the ground. Since the preset potential is higher than the potential of the first terminal of the steering selection switch 81, the first steering port 213 or the second steering port 214 is grounded, that is, the potential of the first steering port 213 or the second steering port 214 is pulled down, and thus the first steering signal or the second steering signal is generated.

The control chip 21 always detects the electric potentials of the first steering port 213 and the second steering port 214, when the user does not select the operation steering of the motor 1, the second end of the steering selection switch 81 is not connected to the first steering port 213 and the second steering port 214, both the first steering port 213 and the second steering port 214 are at the preset electric potentials, and the control chip 21 does not generate the first steering signal and the second steering signal. When the user selects that the operation steering of the motor 1 is the first operation steering, the user operates the second end of the steering selection switch 81 to connect the first steering port 213, so that the first steering port 213 is grounded, at this time, the control chip 21 detects that the first steering port 213 is at a low potential, the control chip 21 further generates a first steering signal, and the motor 1 operates in the first operation steering; when the user selects that the operation steering of the motor 1 is the second operation steering, the user operates the second end of the steering selection switch 81 to connect with the second steering port 214, so that the second steering port 214 is grounded, at this time, the control chip 21 detects that the second steering port 214 is at a low potential, the control chip 21 further generates a second steering signal, and the motor 1 operates in the second operation steering; when the control chip 21 detects that the first steering port 213 and the second steering port 214 are both at the preset potential, the control chip 21 controls the third switch 233 and the fourth switch 234 to be in a conducting state, so that the first electrode 11 and the second electrode 12 are grounded respectively, and the motor 1 does not operate.

Further, the first steering port 213 and the second steering port 214 are respectively connected to the power circuit 3, so that when the power circuit 3 supplies power to the bone drill, the first steering port 213 and the second steering port 214 are at a preset potential, that is, the first steering port 213 and the second steering port 214 of the control chip 21 have a voltage input with a high potential; specifically, the first steering port 213 and the second steering port 214 are connected to the first voltage providing terminal 242 or the second voltage providing terminal 243 of the voltage converting circuit 24, and are connected to the power circuit 3 through the voltage converting circuit 24, so as to allow the power circuit 3 to provide voltage input to the first steering port 213 and the second steering port 214, and fig. 7 shows a case where the first steering port 213 and the second steering port 214 are connected to the second voltage providing terminal 243, although the first steering port 213 and the second steering port 214 may also be connected to the first voltage providing terminal 242 in other embodiments of the present invention, which is not limited herein.

It should be noted that the first steering port 213 and the second steering port 214 are preferably connected to the same voltage providing terminal, i.e. either both are connected to the first voltage providing terminal 242 or both are connected to the second voltage providing terminal 243, which is beneficial to simplify the circuit structure design of the bone drill and simplify the judgment logic of the control chip 21 for detecting the electric potentials of the first steering port 213 and the second steering port 214.

Further, the steering selection switch 81 further includes a control terminal 811, and the control terminal 811 of the steering selection switch 81 allows a user to directly perform manipulation. The steering selection switch 81 has three gears respectively corresponding to the first operation steering, the second operation steering and the suspension, the control terminal 811 allows a user to operate to one of the three gears, so as to select the operation steering of the motor 1 or suspend and lock the drill (i.e. control the motor 1 not to operate), wherein the control terminal 811 is in the gear corresponding to the first operation steering means that the second terminal of the steering selection switch 81 is connected to the first steering port 213, so that the first steering port 213 is grounded and then at a low potential; the control terminal 811 is in the shift position corresponding to the second operation steering means that the second terminal of the steering selection switch 81 is connected to the second steering port 214, so that the second steering port 214 is grounded and thus at a low potential; the control terminal 811 being in the corresponding floating gear position means that the second terminal of the steering selection switch 81 is not connected to the first steering port 213 and the second steering port 214, and both the first steering port 213 and the second steering port 214 are at the preset potential.

Based on the above, the process of using the bone drill provided by the present embodiment is as follows: the power switch 5 is turned on and turned on first, and the first power input end 22 supplies power to the control chip 21, so that the control chip 21 is powered on and detects the potentials of the first steering port 213 and the second steering port 214; then, the user operates the control terminal of the steering selection switch 81 to select the operation steering of the motor 1, and the control chip 21 generates a corresponding steering signal accordingly to control the conduction of the power supply path between the first power input terminal 22 and the motor 1, so that the motor 1 operates in the operation steering selected by the user. And then the power switch 5 is switched off or the control end is controlled to be in a suspended gear, so that the motor 1 is controlled to stop running.

Referring to fig. 1 and 8, the bone drill further includes a power display circuit 9, the power display circuit 9 includes a plurality of indicator lights 91 for indicating the remaining power of the bone drill, and specifically, each indicator light 91 is preferably an L ED light, and each indicator light 91 is respectively connected to a different port of the control chip 21, and the control chip 21 controls whether each indicator light 91 emits light or not, or controls the light emitting state (including blinking, etc.) of each indicator light 91.

Specifically, the power display circuit 9 includes 3 indicator lamps 91, and each indicator lamp 91 is connected to a different port of the control chip 21. When the remaining capacity of the bone drill is in different ranges, controlling the indicator lamps 91 with different numbers to emit light and/or controlling the indicator lamps 91 to be in different light-emitting states to represent the remaining capacity of the bone drill. Fig. 1 and 8 show the case where the power display circuit 9 includes a first indicator light 911, a second indicator light 912 and a third indicator light 913, and the remaining power of the bone drill is represented by the current voltage of the battery assembly 32 (i.e. the battery assembly 32 described in the above embodiments).

For example, when the battery assembly 32 is in a discharging state, the current voltage of the battery assembly 32 is greater than or equal to 11.3V, and the first indicator lamp 911, the second indicator lamp 912 and the third indicator lamp 913 are all turned on; the current voltage of the battery assembly 32 is less than or equal to 10.7V and less than 11.3V, and the first indicator lamp 911 and the second indicator lamp 912 are normally on correspondingly; the current voltage of the battery assembly 32 is less than or equal to 9.9V and less than 10.7V, and the corresponding first indicator lamp 911 is normally on; the current voltage of the battery assembly 32 is less than 9.9V, which corresponds to the first indicator lamp 911 flashing.

When the battery assembly 32 is in the charging state, the current voltage of the battery assembly 32 is greater than or equal to 12.6V, and the corresponding first indicator lamp 911, the second indicator lamp 912 and the third indicator lamp 913 are all on; the current voltage of the battery assembly 32 is less than or equal to 11.3V and less than 12.6V, and the first indicator lamp 911, the second indicator lamp 912 and the third indicator lamp 913 flicker correspondingly; the current voltage of the battery assembly 32 is less than or equal to 10.7V and less than 11.3V, and the first indicator lamp 911 and the second indicator lamp 912 flicker correspondingly; the current voltage of the battery assembly 32 is less than 10.7V, corresponding to the first indicator lamp 911 flashing.

Referring to fig. 9-10, fig. 10 is a view showing a portion of the housing omitted from fig. 9 to expose the internal structure of the drill, and the drill includes a housing 10 serving as a carrier for components such as the circuit of the drill, so that the drill is well adapted for use in surgical operations.

The bone drill further comprises a reduction gearbox 14, the reduction gearbox 14 is arranged at the driving end 13 of the motor 1, the reduction gearbox 14 belongs to the understanding scope of persons skilled in the art, and details about the specific working principle of the reduction gearbox 14 are not described herein.

The bone drill further comprises a first circuit board 101, the first circuit board 101 is arranged in the housing 10 and connected with the motor 1. Specifically, the first circuit board 101 is provided with a control circuit (not shown), the motor 1 is connected to the control circuit for controlling the operation of the motor 1, and the control circuit has been described in detail in the above embodiments, and is not described herein again.

The bone drill further comprises a steering selection switch 81, the steering selection switch 81 is exposed outside the housing 10 and connected to the control circuit on the first circuit board 101, and the operation principle of the steering selection switch 81 is described in detail in the above embodiments and will not be described herein again.

The bone drill further comprises a power switch 5, the power switch 5 is exposed out of the housing 10, and is connected to the motor 1 and the control circuit, respectively, and the working principle of the power switch 5 is explained in detail in the above embodiments, and will not be described herein again.

The bone drill further includes a second circuit board 102 and a battery assembly 32, the second circuit board 102 is provided with a power circuit (not shown), the power circuit is respectively connected to the battery assembly 32 and the power switch 5, the working principle of the power circuit and the battery assembly 32 have been described in detail in the above embodiments, and are not described again here.

The housing 10 includes a holding portion 103, the power switch 5 is disposed adjacent to the holding portion 103, the power switch 5 can be easily touched by the user's fingers to control the on and off of the power switch 5, and the battery pack 32 is disposed inside a portion of the housing 10 corresponding to the holding portion 103.

The housing 10 is provided with slots 104 corresponding to the first circuit board 101 and the second circuit board 102, respectively, and the first circuit board 101 and the second circuit board 102 are embedded in the corresponding slots 104, respectively, so as to fix the first circuit board 101 and the second circuit board 102 in the housing 10.

The bone drill further comprises a charging interface 38, and the housing 10 exposes the charging interface 38 and is used for connecting an external power supply and a power circuit on the second circuit board 102, so as to transmit electric energy from the external power supply to the power circuit, and further charge the battery assembly 32.

The bone drill further includes an indicator light group 914, the indicator light group 914 is connected to the control circuit on the first circuit board 101, the indicator light group 914 includes a plurality of indicator lights 91, the indicator lights 91 are exposed outside the housing 10 for indicating the remaining power of the bone drill, specifically the remaining power of the battery assembly 32, which has been described in detail in the above embodiments, and thus, will not be described again here.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A bone drill, comprising:

the shell is used for a bone drill component and a carrier of a circuit thereof;

the motor is arranged in the shell, and the shell exposes the driving end of the motor;

the first circuit board is arranged in the shell and connected with the motor, and a control circuit connected with the motor is arranged on the first circuit board so as to control the motor to operate;

a steering selection switch exposed outside the housing and connected to a control circuit on the first circuit board to instruct a running steering operation of the motor;

the power switch is respectively connected with the motor and the control circuit, and the power switch and the steering selection switch are matched to control the motor to operate;

the battery assembly is arranged in the shell and transmits electric energy to the motor when the power switch is switched on;

the second circuit board is arranged in the shell and connected with the power switch and the battery pack, the second circuit board is provided with a power circuit connected with the power switch and the battery pack, so that the power switch is conducted with the control circuit when being conducted, and the electric energy of the battery pack is transmitted to the motor.

2. A bone drill according to claim 1, wherein: the steering selection switch is provided with three gears which respectively correspond to a first running steering, a second running steering and a floating gear so as to indicate the running steering of the motor or control the motor not to run.

3. A bone drill according to claim 2, wherein:

the bone drill further comprises a grounding terminal;

the motor includes a first electrode and a second electrode;

the control circuit comprises a control chip and a first electric energy input end, the control chip is respectively connected with the first electric energy input end and the grounding end, and the first electric energy input end is connected with the power switch so as to transmit the electric energy from the battery pack to the motor and the control chip;

the control circuit further comprises a first switch, a second switch, a third switch and a fourth switch, wherein the first switch is respectively connected with the first electric energy input end, the control chip and the first electrode, the second switch is respectively connected with the first electric energy input end, the control chip and the second electrode, the third switch is respectively connected with the control chip, the first electrode and a grounding end, and the fourth switch is respectively connected with the control chip, the second electrode and the grounding end;

the control chip is used for conducting the first switch and the fourth switch so that the motor runs in the first running steering mode; or the control chip is used for conducting the second switch and the third switch, so that the motor runs in the second running direction.

4. A bone drill according to claim 3, wherein: when the motor rotates in the first operation direction or the second operation direction and the control chip receives an emergency stop signal, the third switch and the fourth switch are in a conducting state, and the first electrode and the second electrode are respectively connected to the grounding end, so that the motor stops operating within a preset time.

5. A bone drill according to claim 1, wherein: the battery assembly includes a plurality of lithium batteries.

6. A bone drill according to claim 1, wherein: the shell comprises a holding part, the battery assembly is arranged inside the shell part corresponding to the holding part, and the power switch is arranged close to the holding part.

7. A bone drill according to claim 1, wherein: slots respectively corresponding to the first circuit board and the second circuit board are arranged in the shell, and the first circuit board and the second circuit board are respectively embedded into the corresponding slots and then fixed in the shell.

8. A bone drill according to claim 1, wherein: the bone drill further comprises a charging interface, the shell is exposed out of the charging interface, the charging interface is connected with the power circuit on the second circuit board and used for being connected with an external power supply, and then electric energy from the external power supply is transmitted to the power circuit.

9. A bone drill according to claim 1, wherein: the bone drill further comprises a reduction gearbox, and the reduction gearbox is arranged at the driving end of the motor.

10. A bone drill according to claim 1, wherein: the bone drill further comprises an indicator light set, the indicator light set is connected with the control circuit, and the indicator light set comprises a plurality of indicator lights and is used for indicating the residual electric quantity of the bone drill.

Images